Granted Patent
Utility
US 6,444,720 · App. 09/959,253
Open-cell rigid polyurethane foams
Inventors:
Bert Klesczewski, Jörg Hofmann, Pramod Gupta
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Oct 18, 2001
Inventors
Bert Klesczewski
Jörg Hofmann
Pramod Gupta
Assignee (at issue)
Bayer Aktiengesellschaft
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.